Stone Exhaust Mercedes-Benz M270 W176 Cat-Back Valvetronic Exhaust System for A-Class A180 and A250, including A250 4MATIC, Facelift 2016 to 2018, Pre Bumper Pre Bumber
Unlock the sound and performance your Mercedes-Benz A-Class deserves with the Stone Exhaust Cat-Back Valvetronic Exhaust System for the M270-powered W176 A180 and A250. This premium valved cat-back exhaust delivers an aggressive, sporty tone on demand, a refined cruise with minimal cabin drone, and genuine performance optimisation backed by in-house R and D, 3D scanning and dyno development. If you are searching for Mercedes A180 exhaust, Mercedes A250 exhaust, W176 cat-back, valvetronic exhaust, valved cat back, performance exhaust upgrade for A-Class, this is the system you want.
Designed by Stone Exhaust for precise OEM fitment, this W176 cat-back exhaust has been engineered using 3D scanning and reverse engineering of the factory system to ensure perfect alignment, optimum flow and long-term reliability. Our team at Nforcd has fitted and tested this system and customer feedback has been consistently excellent for sound quality, build quality and day-to-day drivability.
Why choose this W176 A-Class cat-back exhaust
- Valvetronic cat-back exhaust for Mercedes-Benz A-Class W176 A180 and A250, M270 engine
- Remote-controlled valved exhaust with ON, OFF and AUTO modes for instant sound control
- Plug-and-play OBDII controller for quick installation and easy valve management
- One-piece performance design to maximise flow and reduce potential leak points
- In-house dyno developed for real-world performance gains and throttle response
- Eliminates the drone often found on standard exhaust systems
- 3D scanning and reverse engineering for 100 percent OEM fitment precision
- Mechanical welding with precision, direct spot welding and advanced techniques for strength
- Constructed using a 7 axis CNC bending process for superb roundness and accuracy
Valvetronic control. Quiet when you need it, loud when you want it
The Stone Valvetronic system gives you control at your fingertips. Use the dedicated remote to switch between ON, OFF and AUTO. Cruise quietly with the valves closed, or open them instantly for a deeper, sportier tone and enhanced flow. In AUTO, you can set valve behaviour against a predefined RPM, so the exhaust adapts to your driving.
R and D, 3D scanning and precision manufacturing
Stone Exhaust engineers 3D scan OEM Mercedes-Benz W176 A-Class components to capture every mounting point, pipe route and bend angle. That data is used to model gas flow, thermal and pressure zones, and then iteratively refined to achieve optimal performance and fitment. With a 7 axis CNC bending machine, pipe roundness is maintained to industry-leading standards and accuracy error is kept exceptionally low to protect flow and durability.
Advanced welding for strength and reliability
Crisscross and overlapping welding techniques are used to increase weld penetration and width at high stress points. Direct spot welding with mechanical welding arms delivers superior precision and consistency versus manual-only approaches. The result is a robust, high quality cat-back that stands up to hard use.
OPF delete option
For OPF-equipped cars, Stone offers an OPF delete solution at no additional charge. This allows installation of the Stone cat-back on OPF cars without triggering an error code, so coding out the OPF on the ECU is not required.
Fitment and compatibility
Engine: Mercedes-Benz M270
Platform: A-Class W176 5-door hatchback
- A180 BlueEFFICIENCY 2016 to 2018 facelift
- A250 BlueEFFICIENCY 2016 to 2018 facelift
- A250 4MATIC BlueEFFICIENCY 2016 to 2018 facelift
- A250 Sport 2016 to 2018 facelift
Suitable for the Pre Bumper Pre Bumper style as listed.
Part number
MP508S
Fitting and installation
We recommend professional installation. Nforcd offers expert fitting at our Warwickshire facility. For a quote and availability, contact our team at Sales@nforcd.com.
What our customers say
We have installed this Stone Exhaust system for W176 A-Class owners who wanted a premium valved cat-back. Feedback highlights an addictive exhaust note with valves open, a comfortable, drone-free cruise with valves closed and a noticeable uplift in response. It is a top-tier Mercedes A-Class exhaust upgrade that looks, fits and sounds the part.
Warranty
Stone Exhaust 2 Year Warranty.
Videos
Stone Valvetronic System Installation
Stone Exhaust Mercedes-Benz M270 W176 A250 Cat-Back Valvetronic Sound
Search-friendly terms
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